A =30 then show that cos3a =4cos cube a - 3cos a
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a is 30 °
also, we know that Cos 30° is √3/2
therefore, Cos 3 a =90° =0
LHS =Cos 90°
RHS = Cos^3 30°-3Cos 30°
a is 30 °
also, we know that Cos 30° is √3/2
therefore, Cos 3 a =90° =0
LHS =Cos 90°
RHS = Cos^3 30°-3Cos 30°
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